WO2008009244A1 - Vorrichtung und verfahren zur erfassung eines messwertes - Google Patents
Vorrichtung und verfahren zur erfassung eines messwertes Download PDFInfo
- Publication number
- WO2008009244A1 WO2008009244A1 PCT/DE2006/001228 DE2006001228W WO2008009244A1 WO 2008009244 A1 WO2008009244 A1 WO 2008009244A1 DE 2006001228 W DE2006001228 W DE 2006001228W WO 2008009244 A1 WO2008009244 A1 WO 2008009244A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- housing
- sensor
- measured value
- coupling device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
Definitions
- the invention relates to a device and a method for detecting a measured value in the interior of the housing of a motor or generator.
- Electric drives are very common today in the industrial environment. Both for controlling and for monitoring the electric motors used in this case, measured values from the interior of the housing often have to be determined. To ensure this, sensors, such as temperature sensors, bearing current sensors, vibration and torque sensors, mounted directly inside the engine. An evaluation unit for evaluating the measured values detected by the sensors is usually placed outside the motor housing for practicable reasons.
- Sensor values is a transmission of the measured values from the sensor to the evaluation unit by radio.
- at least one radio receiver of the evaluation also inside the Motorarch. Generator housing arranged, the motor housing shields electromagnetic fields and thus resembles in its effect a Faraday 'see cage.
- a radio transmitter connected to a temperature sensor is mounted on the rotor of the asynchronous machine and sends in the event of an overtemperature a radio signal to a likewise mounted inside the engine radio receiver.
- the invention is based on the object of enabling a wireless transmission of measured values from the housing interior of an engine or generator to a receiver arranged outside the housing.
- a device for detecting a measured value inside the housing of a motor or generator which has an at least in rotating operation electrically insulated from the housing shaft, at least a first, located inside the housing portion of the shaft with a second,
- the device is provided with a sensor suitable for measuring the measured value, a coupling device for coupling a measuring signal suitable for transmitting the measured value into the first section of the shaft, and a radio receiver for receiving the second section Having the wave radiated measurement signal outside the housing.
- the object is further achieved by a method for detecting a measured value in the housing interior of a motor or generator, which has an electrically mounted at least in rotating operation isolated from the housing shaft, wherein at least a first, located inside the housing section of the shaft with a second , arranged outside the housing portion of the shaft is electrically connected, comprising the following method steps: Measuring the measured value with a suitable sensor, coupling a measuring signal suitable for transmitting the measured value into the first section of the shaft with a coupling device, and - receiving the measuring signal radiated from the second section of the shaft with a radio receiver located outside the housing.
- the invention is based on the finding that the generally accepted doctrine that a motor or a generator is a Faraday cage and therefore shields electromagnetic fields in such a way that electrical signals could not be emitted to the outside does not apply in the generalization.
- the basic idea here is to break the shield effect of the housing by a suitable excitation of the shaft. The prerequisite for this is that the shaft is at least in the operation of the motor or generator with a rotating shaft mounted electrically isolated from the housing and at least partially protrudes from the housing. The protruding from the housing part of the shaft must be electrically connected to a stimulated in the housing interior and of the coupling device part of the shaft.
- the shaft transports the measuring signal out of the housing to the outside, wherein said second section takes over the function of a radio antenna.
- the second, arranged outside the housing portion of the wave radiates the measurement signal by electromagnetic means via the air, so that it can be received by the radio receiver arranged outside the housing and finally evaluated.
- the prerequisites for the measuring signal transmission according to the invention are that the shaft is mounted in an electrically insulated manner relative to the housing, at least during operation, and that said first section and said second section are conductively connected. are connected to each other, are usually given in almost all electric and internal combustion engines and generators.
- the isolated bearing of the shaft results from the electrically insulating lubricating film of the shaft bearings. This often forms completely only at the rotating shaft, so that the radio transmission according to the invention may not work at standstill of the shaft.
- an embodiment of the invention is advantageous in which the coupling device for excitation of the shaft is provided such that the wavelength of the measurement signal in air is less than or equal to is four times the length of the second section.
- a minimal attenuation of the measurement signal is effected in a further advantageous embodiment of the invention, in which the coupling device for exciting the shaft is provided such that the electric field strength extends substantially radially between the housing inner wall and the shaft.
- the excitation of the shaft can be carried out without contact in an advantageous embodiment of the invention, wherein the coupling device comprises an electric dipole or monopole antenna.
- the coupling device comprises an electric dipole or monopole antenna.
- such a dipole or monopole antenna is perpendicular to the shaft.
- the coupling device may be provided for capacitive, inductive or electromagnetic coupling of the measuring signal in the first portion of the shaft.
- the senor may be provided for vibration measurement or torque measurement.
- an embodiment of the invention is advantageous in which the sensor is provided for temperature measurement, in particular of a bearing ring. Such a measurement is useful for monitoring purposes to extend the life.
- a further embodiment of the invention is characterized in that the sensor for current measurement, in particular a bearing current, is provided.
- the bearing current monitoring must also be used for maintenance purposes in order to prevent operational failures.
- FIG. 1 shows an embodiment of a device for detecting a measured value in the interior of an engine
- Figure 1 shows an embodiment of a device for detecting a measured value in the interior of an engine 1, wherein only one housing end of the engine 1 is shown in cross-section to explain the invention.
- the temperature of a bearing 12, which serves for supporting a shaft 3 of the motor 1 is detected inside a housing 7 of the motor 1 and transmitted to a radio receiver 6 arranged outside the housing 7.
- the shaft 3 of the motor 1 is mounted by the bearing 12 at least in rotating operation insulating against the housing 7. The insulation is due to the lubricating film of the bearing 12.
- the temperature of the bearing 12 is detected by means of a temperature sensor 4.
- a measuring signal corresponding to the measured temperature is capacitively coupled into the shaft 3 of the motor 1 with the aid of a coupling device 5, which is shown here only schematically as a dipole antenna with counterweight.
- the capacitive coupling takes place in a first section of the shaft 2, which is located in the interior of the engine 1.
- the shaft 2 comprises a second section 3, which protrudes from the housing over a length L, wherein the second section 3 of the shaft 2 is electrically conductively connected to the first section of the shaft 2, in which the measuring signal is coupled.
- the minimum frequency of the measurement signal in air results here:
- FIG. 1 also shows how the electromagnetic properties of a motor or generator can be used efficiently for signal transmission. It shows how the shielding effect of the housing, which according to common doctrine acts in the sense of a Faraday cage, can be skillfully bypassed, and via the second section 3 of the shaft 2 radio signals from the housing interior of a motor 1 can be transmitted to the outside ,
- FIG. 2 shows a profile of the electric field strength 11 between a shaft 2 of a motor and its housing 7 in the case of Transmission of a measurement signal according to an embodiment of the invention.
- the measurement signal was coupled into a section of the shaft 2 located in the interior of the housing 7 in such a way that a radial field strength course between the housing 7 and the shaft 2 results.
- FIG. 3 shows a sensor 4 and a coupling device 5 for coupling a measuring signal into a shaft 2 of a motor or generator according to a further embodiment of the invention.
- the sensor 4 is used, for example, the bearing current measurement for maintenance purposes.
- the measured variable detected by it is converted by an oscillator 9 of the coupling device 5 into a high-frequency measuring signal.
- efficient wireless data transmission results at a frequency of 2.4GHz.
- the measurement signal is capacitively coupled into the shaft 2 of the motor. This is followed by the already described transmission of the measurement signal via the shaft 2 to the outside.
- the housing 7 of the motor 1 is operated in the described embodiments of the invention, together with the shaft 2 similar to a coaxial cable, which is excited by a transversal electromagnetic wave (TEM wave).
- TEM wave transversal electromagnetic wave
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001228 WO2008009244A1 (de) | 2006-07-17 | 2006-07-17 | Vorrichtung und verfahren zur erfassung eines messwertes |
DE112006004035T DE112006004035A5 (de) | 2006-07-17 | 2006-07-17 | Vorrichtung und Verfahren zur Erfassung eines Messwertes |
EP06761806A EP2041522A1 (de) | 2006-07-17 | 2006-07-17 | Vorrichtung und verfahren zur erfassung eines messwertes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001228 WO2008009244A1 (de) | 2006-07-17 | 2006-07-17 | Vorrichtung und verfahren zur erfassung eines messwertes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008009244A1 true WO2008009244A1 (de) | 2008-01-24 |
Family
ID=37828144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/001228 WO2008009244A1 (de) | 2006-07-17 | 2006-07-17 | Vorrichtung und verfahren zur erfassung eines messwertes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2041522A1 (de) |
DE (1) | DE112006004035A5 (de) |
WO (1) | WO2008009244A1 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3367546A1 (de) * | 2017-02-27 | 2018-08-29 | Siemens Aktiengesellschaft | Vorrichtung und verfahren zur überwachung eines ableitstromes |
US20200060077A1 (en) * | 2018-08-27 | 2020-02-27 | Honda Motor Co., Ltd. | Internal combustion engine with wireless communications device |
US10785908B2 (en) | 2018-08-27 | 2020-09-29 | Honda Motor Co., Ltd. | Internal combustion engine with integrated connectivity device |
WO2020212135A1 (de) * | 2019-04-15 | 2020-10-22 | Vitesco Technologies GmbH | Elektrische maschine und verfahren zum ermitteln eines fehlers einer elektrischen maschine |
US10819194B2 (en) | 2018-08-27 | 2020-10-27 | Honda Motor Co., Ltd. | Internal combustion engine with integrated connectivity device |
DE102020121268A1 (de) | 2020-08-13 | 2022-02-17 | Schaeffler Technologies AG & Co. KG | Maschine mit mindestens einem Maschinenbauteil |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907221A (en) * | 1929-02-05 | 1933-05-02 | Anderson Co | Electric motor |
GB2083321A (en) * | 1980-09-03 | 1982-03-17 | Marconi Co Ltd | A method of signalling along drill shafts |
-
2006
- 2006-07-17 EP EP06761806A patent/EP2041522A1/de not_active Withdrawn
- 2006-07-17 WO PCT/DE2006/001228 patent/WO2008009244A1/de active Application Filing
- 2006-07-17 DE DE112006004035T patent/DE112006004035A5/de not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907221A (en) * | 1929-02-05 | 1933-05-02 | Anderson Co | Electric motor |
GB2083321A (en) * | 1980-09-03 | 1982-03-17 | Marconi Co Ltd | A method of signalling along drill shafts |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3367546A1 (de) * | 2017-02-27 | 2018-08-29 | Siemens Aktiengesellschaft | Vorrichtung und verfahren zur überwachung eines ableitstromes |
WO2018153680A1 (de) * | 2017-02-27 | 2018-08-30 | Siemens Aktiengesellschaft | Vorrichtung und verfahren zur überwachung eines ableitstromes |
US20200060077A1 (en) * | 2018-08-27 | 2020-02-27 | Honda Motor Co., Ltd. | Internal combustion engine with wireless communications device |
US10756603B2 (en) * | 2018-08-27 | 2020-08-25 | Honda Motor Co., Ltd. | Internal combustion engine with wireless communications device |
US10785908B2 (en) | 2018-08-27 | 2020-09-29 | Honda Motor Co., Ltd. | Internal combustion engine with integrated connectivity device |
US10819194B2 (en) | 2018-08-27 | 2020-10-27 | Honda Motor Co., Ltd. | Internal combustion engine with integrated connectivity device |
WO2020212135A1 (de) * | 2019-04-15 | 2020-10-22 | Vitesco Technologies GmbH | Elektrische maschine und verfahren zum ermitteln eines fehlers einer elektrischen maschine |
DE102020121268A1 (de) | 2020-08-13 | 2022-02-17 | Schaeffler Technologies AG & Co. KG | Maschine mit mindestens einem Maschinenbauteil |
Also Published As
Publication number | Publication date |
---|---|
DE112006004035A5 (de) | 2009-06-18 |
EP2041522A1 (de) | 2009-04-01 |
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